Roku Labs sent us their SoundBridge M1000 with the new SoundBridge 2.0 software that supports now Microsoft's Windows Media Connect and Windows Media Player 10.
The SoundBridge was already compatible with iTunes. It supports also Napster and other music services.
I had the SoundBridge M1000 running since a couple of weeks now. I only tested the Soundbridge with Windows Media Connect as there are older reviews out there that tested the wireless music streaming solution with iTunes.